1,4,7,10-TETRAAZACYCLODODECANE-1,4-DIACETIC ACID DERIVATIVES AS CHELATING AGENTS
申请人:BRACCO S.p.A.
公开号:EP1602649A2
公开(公告)日:2005-12-07
A process for the preparation of compounds of formula (XI)
starting from compounds of formula (VII)
or (VIII),
in which
R is a hydrogen atom, a straight or branched or cyclic C1-C6 alkyl group, unsubstituted or substituted by 1 to 10 oxygen atoms, or a C1-C20 alkyl group, optionally interrupted by a phenylene, in its turn substituted by a straight or branched C1-C6 alkyl group, unsubstituted or substituted by 1 to 3 C1-C7 groups; the aromatic group being unsubstituted or substituted by, carboxy, sulfamoyl, hydroxyalkyl, amino groups by hydrolysis in basic conditions at high temperature and under pressure.